Open Source Raytracer with a scene description language that provides constructs for programming like loops and functions. Its written in C++ and runs on Windows and Linux/Unix.

Plug-in for Rhino, uses both raytracing and radiosity to create single-frame images and animations. Product description, gallery, training, evaluation download, and purchasing. For Windows.

Regular awards for best raytraced still images and animations submitted by the public. Site includes most recent winners, voting on the current round, and the topic and rules for submitting to the next round.

An object oriented library with API in C++ and Python for synthetic rendering, which provides a common environment and description language to treat light distribution in three dimensional spaces. Available for Linux and Windows.

A realtime raytracing engine with downloadable benchmark, screenshots and information.

A new interface that is supposed to become the OpenGL of interactive ray tracing. Contains publications, gallery and some links.

A simple raytracer in development, it supports the basic features of a raytracer along with multi-threading. Many platforms are supported